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Coincidence-Free Bell Tests via Post-Selection Alignment of Independent Quadrature Measurements

Abstract

We present a novel approach to Bell tests that eliminates coincidence windows while simultaneously addressing multiple experimental loopholes. Using dual-quadrature homodyne detection with randomly selected measurement angles for each ensemble of photon pairs, we demonstrate that quantum correlations can be verified through ensemble averaging without real-time coordination between spacelike-separated detectors. Alice and Bob collect completely independent measurement streams which, when post-aligned through bit-shift analysis, reveal quantum correlations only at perfect stream alignment with statistical significance beyond 100σ. This ensemble-level verification with random settings per ensemble simultaneously addresses the coincidence window problem, the fair sampling loophole, and the settings independence loophole, while proving that correlation information emerges through proper ensemble alignment without requiring real-time spacelike coordination.

Keywords

coincidence-free protocol, quantum correlations, loophole-free, local encoding, homodyne detection, Bell tests, pair-level verification

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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green